Smoke trap



Feb. 23 1926.

1,573,951 E. P. TRESE SMOKE TRAP Filed Mlrch l5, 1924 .5- INVENTOR. 7 /.Edward 72e.: e.

A TTORNEY.

Patented Feb. Z3, 1925.

EDWARD 1. THESE, 0F BAY CITY, MICHIGAN.

sivroKn TRA?.

' Application filed March 15, 1924. Serial No. 699,427.

-like nature.

The prime object of the invention is to pivotally mount a smoke trap in the fuel passage so that when the fire door is opened for charging the furnace, smoke and gas will not escape through the opening.

Another object is to provide a smoke trap and means whereby it can be secured in raised position for the insertion of a bar through the lire door opening to remove clinkers or for other purposes.

A further object is to design a very simple, substantial and inexpensive smoke trap, which swings up when a shovelful of coal is placed in the furnace, and automatically drops back to position when the shovel is withdrawn.

vWith the above and other objects in view, the present invention consists in the combination and arrangement of parts, hereinafter more fully described, illustrated in the accompanying drawings and particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportion and miner details of construction without departingfrom the spirit, or sacrificing any of the advantages of the invention.

In the drawings.

Fig. l is a side view of a heating furnace showing my improved smoke trap in place.

Fig. 2 is a fragmentary sectional side view of the fire door and fuel passage, the smoke trap beingshown in position therein.

Fig. 3 is a similar view showing the smoke trap in raised position.

Fig. a is a fragmentary top plan view of the fuel vpassage and smoke trap.

Fig. 5 is an isometric view of the smoke trap plate.

lVhen charging a furnace or other heat ing plant the lire door is opened and the coal or fuel shoveled in through this fuel passage or opening, which allows smoke and gases to escape through this opening, and

this is `)Lrarticularly noticeable when a furnace has been iu operation for a time, and considerable soot adheres to the smoke passage und liucs. This disagreeable feature I have overcome by providing means in the fuel passage opening for automatically clos ing the passage when the shovel is with drawn, the shovelful of fuel forcing it up to allow the fuel to be shoveled into the iirepot and dropping of its own weight when the shovel is withdrawn.

Referring now particularly to the drawing, in which I have shown the preferred embodiment of my invention, the numeral 5 indicates a conventional hot air furnace, and while in the present instance I have shown a hot air furnace, it will bc obvious that it is equal adaptable for steam, hot wator and other types of heating plants.

A flat plate men'lber 6 is pivotally hung to the door frame which forms a part of the fuel passage 7, and is provided with openings 8 therein and by means of which the plate is hung on the turned end of the bolt members 9 which are secured to the top wall of the fuel passage, these are formed substantially similar to an eye bolt, the end being threaded and adapted to receive a nut in the usual manner, the other end having an open eye to allow the plate to be hung thereon, the other end of the plate being free and hanging at an angle in the passageway to form a closure therefor. By securing to the door frame, the device can be installed on furnaces which are set up and jacketed, it being merely necessary to drill the two openings as shown.

For holding the plate in raised position to allow for unobstructed access to the interior of the furnace, a clip member 10 is pivotally secured to the upper wall of the fuel passage by means of the bolt ll, this member normally being turned to position as indicated in dotted lines in Fie. l of the drawings, but when it is desired to hold the smoke trap in raised position, this clip is turned to position as shown in Fig. 3 of the drawing.

The provision of the clip for holding the plate member in raised position.y is both inexpensive and satisfactory, but it will be understood that this may be accomplished in various ways.

From the foregoing description it will be obvious that I have perfected avery simple, effective and economical smoke trap for preventing the escape of smoke and gases through the fire door.

What I claim is Y l. The combination with a furnace having an elongated fuel entrance passage leading thereto, a nat door mounted Withinsaid passage to swing entirely therein, and forming a closure for said passage.

2. The combination With a furnace having an elongated fuel entrance passage leading thereto, a flat door mounted Within said passage to swing entirely therein, and forming a closure therefor, and manually operable means for holding said door in raised position.

3. The combination with a furnace having an elongated fuel entrance passage leading thereto, a flat door mounted Within said passage to swing entirely therein, and forming a closure therefor, and a clip pivotally connected to the Wall adjacent the said plate, and adapted to hold the door in raised position.

In testimony whereof I hereunto afiX mysignature.

. EDWARD P. TRESE. 

